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Patent Searching and Data


Title:
COATED GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2016/152119
Kind Code:
A1
Abstract:
Provided is a chromate-free coated galvanized steel sheet which exhibits excellent corrosion resistance, especially excellent corrosion resistance in a cut end surface or a processed portion such as a bent portion. A coated galvanized steel sheet according to the present invention is obtained by sequentially forming, on at least one surface of a galvanized steel sheet, a chemical conversion coating film that does not contain a chromate compound, a primer coating film that does not contain a chromate compound, and a top coating film. The chemical conversion coating film contains an anionic urethane resin (a) having an ester bond, an epoxy resin (b) having a bisphenol skeleton, a vanadium compound, a zirconium compound and a fluorine compound, respectively in predetermined amounts. The primer coating film is mainly composed of a polyester resin having a urethane bond, and contains a vanadium compound, a phosphoric acid compound and magnesium oxide. The primer coating film has an elongation at break at 25°C of 20% or more and a tensile strength at 25°C of 20 MPa or more.

Inventors:
OKUMA TOSHIYUKI (JP)
SHIGEKUNI TOMOFUMI (JP)
OSAWA YUSUKE (JP)
FURUTA AKIHIKO (JP)
Application Number:
PCT/JP2016/001559
Publication Date:
September 29, 2016
Filing Date:
March 17, 2016
Export Citation:
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Assignee:
JFE GALVANIZING & COATING CO LTD (JP)
International Classes:
C23C22/60; B32B15/08; C09D5/00; C09D5/08; C09D7/12; C09D175/06; C23C2/06; C23C28/00; C23C2/12; C23C2/28
Foreign References:
JP2010156020A2010-07-15
JP2000026798A2000-01-25
JPH01131281A1989-05-24
JP2000199075A2000-07-18
JPS5578063A1980-06-12
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
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